The way I solve this problem is to use nnn instead of ls. It’s a full file manager for the terminal but so light and quickly started that it’s as convenient as ls (a lot more so actually). You can navigate around your file system with vim-like key bindings and then have the option to exit either to the directory you started from or the one currently displayed.

As others have said, using UTC is the most reliable solution to communicating times across time zones. Everyone only needs to know their own offset (which might change twice a year if their location uses DST). A handy way to mark times as UTC is to attach a “Z” as in 20:00Z, which is part of the international standard covering dates and times ISO 8601.